When installing .msi files from official releases in si-gui, it is not possible to customize the installation to exclude language specific files like dictionaries and UIs, so all the files in the .msi file get extracted to a given location. With all this extracted, it takes up ~1gb per installation and i have written a batch script, that if run within the installed folder, that will remove all of the non-needed language files and freeing up around ~500mb. You can the batch file at < http://pastebin.com/FdHr0YLE >. The script is also customizable to retain the language files of one additional language other than english.